The Cat Haven of Western Australia has opened 115 new pens to house stray cats.

The pens, dubbed "cat condos", have been built with the help of a $420,000 state government grant and will house stray cats on behalf of 11 local governments spanning from Stirling to Cockburn.

Each condo has separate living, sleeping and toilet areas, and is air-conditioned to keep cats cool in the middle of the WA summer.

The not-for-profit cattery is hoping that having a central place to house the animals will make it easier to reunite lost cats with their owners, or to rehome them with new owners.

Since the introduction of the Cat Act last year, cats must be microchipped, sterilised, and registered with their local governments by the age of six months.

They must also wear collars and registration tags.

Minister for Local Government and cat owner, Tony Simpson, says the measures are working.

"We're now starting to regulate the cats within our communities, and we've seen a big impact on the amount of unwanted cats," he said.

The number of strays taken in by the Cat Haven has dropped 25 per cent since the Cat Act was introduced last November.

They received 6,229 cats last year - 2,259 fewer than the year before.

But Mr Simpson says despite the drop in numbers, people need to continue being responsible for their animals.

"Make sure you go through the right process. [It is] very important to have it registered, as well as desexing and the microchipping so we can know how many cats we've got, but it's also about the responsible ownership of cats," he said.

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